As far as I can see it and how different youtubers described it, the product placement is as follows:
Lumix S1IIe
2.800€. Improved version of the S5IIx. Same 24MP sensor, but the rest better (body, AF, speed, processor, EVF, tilting screen etc.). More expensive than launch price of S5IIx to be able to offer both at different price levels. User shall decide depending on budget and required tech.
Lumix S1II
3.500€. New 24 MP half-stacked sensor. Improved version of S1H and merger with S1. All features are better than with S1H and it is 800 USD cheaper than the S1H at launch. Same body as S1IIe and S1RII. optimized for video, best rolling shutter of all 3. Not yet a sports camera.
Lumix S1RII
3.600€. New BSI (non stacked) 44MP sensor. Replaces the S1R. In almost all features better than S1R and in some on par (i.e. EVF). AF etc. same as with S1II and S1IIe. Image quality for photography better than S1R and S1II. Not just resolution, also colours etc. Because of sensor and MP, rolling shutter risk with video
S9 (street price 1.200€), S5 (street price 999€), S5II (street price 1.900€) and S5IIx (street price 2.200€) stay in the product line. Products on all price levels and below the 3 new bodies.